This is the 10992nd most frequent Russian word.
газопровода
Pipeline for transporting gas.
Here, "газопровода" refers to the gas pipeline specifically as the object of the sentence that needs repair, showing possession or specificity in its genitive singular form.
Газопровода требуется ремонт.
The gas pipeline requires repair.
"Газопровода" is again in genitive singular, used here to specify what project (the gas pipeline) is being referred to in the context of its design completion.
Проектирование газопровода завершено.
The design of the gas pipeline is complete.
Here, "газопровода" also takes the genitive case, used to specify the entity (the gas pipeline) for which safety considerations are being evaluated.